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Author Topic: Transmission/clutch noise  (Read 3584 times)
Mark's 68 L78 RS SS
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« on: October 12, 2006, 02:15:42 AM »

Guys:

I am getting a minor squeal when I let the clutch out in neutral.  As soon as the clutch starts to engage the squeal starts.  One knowledgeable guy said it was transmission, possibly a bearing.  Does this sound right?  Would fairly suck if that's the case.  BTW L78, M22.  Pretty new clutch in good shape.

Thanks

Mark
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Mark
Skaneateles, NY
68 L78 RS SS M22
hotrod68
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« Reply #1 on: October 12, 2006, 11:43:35 PM »

I'd guess it's the throwout bearing, not the transmission. Man, have I been there!
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HotRod'68  1968 SS350 coupe undergoing frame-off resto/rod. 386/350/4.11s
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RamAirDave
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« Reply #2 on: October 13, 2006, 01:04:59 AM »

I've never had that happen, but I would think TO bearing or an alignment issue.
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Mark's 68 L78 RS SS
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« Reply #3 on: October 13, 2006, 06:15:54 AM »

Well that's what I was thinking too but being a newbie I wanted to get some more experienced opinions.  I will try to check it out this weekend if it doesn't snow  Angry

Thanks

Mark
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Mark
Skaneateles, NY
68 L78 RS SS M22
JohnZ
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« Reply #4 on: October 13, 2006, 09:36:46 AM »

Based on your symptom, I'd vote for the input shaft bearing. With the clutch pedal on the floor (clutch disengaged), the input shaft isn't turning - the only relative motion is between the input shaft and the pilot bushing, and the throwout bearing is rotating. When the clutch pedal comes up and the clutch starts to engage, the input shaft spins up, and when the pedal is all the way up, motion stops between the pilot bushing and the input shaft, and the throwout bearing is off the clutch fingers and stops rotating.
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Mark's 68 L78 RS SS
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« Reply #5 on: October 27, 2006, 05:17:34 PM »

I will be looking at the clutch/transmission this weekend, weather permitting.  Some more info is that the car is wanting to creep forward in neutral when I let the clutch out.  Does this help with the diagnosis?

Mark
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Mark
Skaneateles, NY
68 L78 RS SS M22
gro51
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« Reply #6 on: October 27, 2006, 08:54:20 PM »

I had the same symptoms about 5 years ago, especially the fwd creep.   Mine is a L48, M21.    John Z. is right.   I  had the input shaft bearing replaced and the problem was fixed.
« Last Edit: October 28, 2006, 09:40:07 AM by gro51 » Logged

Joe
Schodack, NY

'68 SS/RS 350, M21, 3:73, Rallye Green, Black Deluxe Interior
Mark's 68 L78 RS SS
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« Reply #7 on: October 28, 2006, 04:35:09 AM »

Joe:

Thanks for the verification of John's diagnosis.  This is a big help.  I will let y'all know when it is fixed.

John and the rest of the folks, thanks too for all your help.  You guys are great.  Smiley

Mark 
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Mark
Skaneateles, NY
68 L78 RS SS M22
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